Joe, those who chose war over peace have to accept that that decision can attract certain consequences. The North set out with a deliberate plan to attack and invade the South and they did that with the full knowledge and support of both PRC & the USSR. The war, the chosen action of the North and it's supporters resulted in ~2.5 million deaths. Up until the arrival of "volunteer" units of the Chinese Army in the war the bombing policy had been strictly military targets only, after their intervention it changed - things do in time of war - large centres of population also happen to contain main transport hubs and central administrative infrastructure vital for the mass movement of troops and the supplies that they need. Was it the correct decision? Ask the people of South Korea, it was after all they who would have been coerced into the joys of rule by the Kim dynasty had the UN failed to protect them.